Spin relaxation due to spin–orbit coupling in multi-electron quantum dots
We show that the number of electrons confined in a semiconductor quantum dot has a strong influence over the Rashba and Dresselhaus spin–orbit (SO) admixture. This can be exploited to improve the lifetime of spin excitations, as compared to the usual one- and two-electron devices. The physical mecha...
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| Published in: | Physica. E, Low-dimensional systems & nanostructures Vol. 40; no. 6; pp. 1804 - 1806 |
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| Main Authors: | , , , , |
| Format: | Journal Article Conference Proceeding |
| Language: | English |
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Elsevier B.V
01-04-2008
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| Abstract | We show that the number of electrons confined in a semiconductor quantum dot has a strong influence over the Rashba and Dresselhaus spin–orbit (SO) admixture. This can be exploited to improve the lifetime of spin excitations, as compared to the usual one- and two-electron devices. The physical mechanisms reducing SO admixture are discussed, and numerical results for realistic weakly confined GaAs/AlGaAs dots are reported. |
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| AbstractList | We show that the number of electrons confined in a semiconductor quantum dot has a strong influence over the Rashba and Dresselhaus spin–orbit (SO) admixture. This can be exploited to improve the lifetime of spin excitations, as compared to the usual one- and two-electron devices. The physical mechanisms reducing SO admixture are discussed, and numerical results for realistic weakly confined GaAs/AlGaAs dots are reported. |
| Author | Bertoni, A. Molinari, E. Rontani, M. Goldoni, G. Climente, J.I. |
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| CitedBy_id | crossref_primary_10_1088_0031_8949_88_05_058302 crossref_primary_10_1103_PhysRevB_82_045311 |
| Cites_doi | 10.1103/PhysRev.100.580 10.1103/PhysRevA.57.120 10.1038/nature00976 10.1088/0022-3719/17/33/015 10.1103/PhysRevLett.94.196802 10.1103/PhysRevB.75.035323 10.1103/PhysRevB.50.17271 10.1103/PhysRevB.75.081303 10.1103/PhysRevB.76.085305 10.1103/PhysRevLett.91.196802 10.1134/1.1561977 10.1103/PhysRevLett.95.056803 10.1103/PhysRevB.64.125316 10.1103/PhysRevB.61.12639 10.1103/PhysRevLett.98.126601 10.1103/PhysRevB.73.205341 |
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| Keywords | 72.10.Di Spin–orbit 73.22.Lp Quantum dots 73.21.La 71.70.Ej Many-body effects Phonon scattering Aluminium arsenides Many body theory Gallium arsenides Semiconductor materials Two-level systems 73.21.La; 71.70.Ej; 72.10.Di; 73.22.Lp Zeeman effect Many electron system Spin relaxation Spin-orbit interactions Quantum dots; Spin-orbit; Phonon scattering; Many-body effects Singlet triplet transition Carrier density |
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| References | Bychkov, Rashba (bib12) 1984; 17 Hanson, Willems van Beveren, Vink, Elzerman, Naber, Koppens, Kouwenhoven, Vandersypen (bib15) 2005; 94 Chaney, Maksym (bib10) 2007; 75 Dickmann, Hawrylak (bib16) 2003; 77 Chakraborty (bib1) 1999 S. Amasha, K. MacLean, I. Radu, D.M. Zumbühl, M.A. Kastner, M.P. Hanson, A.C. Gossard, cond-mat/0607110. The Rashba and Dresselhaus SO coupling constants are Dresselhaus (bib13) 1955; 100 Khaetskii, Nazarov (bib18) 2001; 64 are used. Loss, DiVicenzo (bib11) 1998; 57 and well width Bockelmann (bib2) 1994; 50 Climente, Bertoni, Goldoni, Rontani, Molinari (bib9) 2007; 76 respectively. Same material parameters as in Ref. Climente, Bertoni, Goldoni, Rontani, Molinari (bib8) 2007; 75 Cartoixa, Wang, Ting, Chang (bib14) 2006; 73 Khaetskii, Nazarov (bib7) 2000; 61 Meunier, Vink, Willems van Beveren, Tielrooij, Hanson, Koppens, Tranitz, Wegscheider, Kouwenhoven, Vandersypen (bib5) 2007; 98 and Fujisawa, Austing, Tokura, Hirayama, Tarucha (bib3) 2002; 419 Sasaki, Fujisawa, Hayashi, Hirayama (bib4) 2005; 95 The QD has a lateral confining parabola of Hanson, Witkamp, Vandersypen, Willems van Beveren, Elzerman, Kouwenhoven (bib19) 2003; 91 Hanson (10.1016/j.physe.2007.09.127_bib19) 2003; 91 Meunier (10.1016/j.physe.2007.09.127_bib5) 2007; 98 Climente (10.1016/j.physe.2007.09.127_bib8) 2007; 75 Khaetskii (10.1016/j.physe.2007.09.127_bib18) 2001; 64 Khaetskii (10.1016/j.physe.2007.09.127_bib7) 2000; 61 Hanson (10.1016/j.physe.2007.09.127_bib15) 2005; 94 Fujisawa (10.1016/j.physe.2007.09.127_bib3) 2002; 419 Chakraborty (10.1016/j.physe.2007.09.127_bib1) 1999 10.1016/j.physe.2007.09.127_bib6 Chaney (10.1016/j.physe.2007.09.127_bib10) 2007; 75 Sasaki (10.1016/j.physe.2007.09.127_bib4) 2005; 95 Dickmann (10.1016/j.physe.2007.09.127_bib16) 2003; 77 Cartoixa (10.1016/j.physe.2007.09.127_bib14) 2006; 73 Dresselhaus (10.1016/j.physe.2007.09.127_bib13) 1955; 100 10.1016/j.physe.2007.09.127_bib17 Loss (10.1016/j.physe.2007.09.127_bib11) 1998; 57 Bockelmann (10.1016/j.physe.2007.09.127_bib2) 1994; 50 Climente (10.1016/j.physe.2007.09.127_bib9) 2007; 76 Bychkov (10.1016/j.physe.2007.09.127_bib12) 1984; 17 |
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| Snippet | We show that the number of electrons confined in a semiconductor quantum dot has a strong influence over the Rashba and Dresselhaus spin–orbit (SO) admixture.... |
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| SubjectTerms | Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Exact sciences and technology Many-body effects Phonon scattering Physics Quantum dots Spin–orbit |
| Title | Spin relaxation due to spin–orbit coupling in multi-electron quantum dots |
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